Engraver&#39;s ring-clamp.



A. H. MYHRE.

ENGRAVERS RING CLAMP.

APPLICATION-FILED FEB. 5, 1915.

1,157,120, Patented 0015.19, 1915.

cccccccc PLANOQIAPH co.. WASHINGTON. D.

j the clamping 'members unirsi) ARTHUR HALFDAN MYHRE,

or Tacoma, WASHINGTON.

ENGRAvERs RING-emitir.

Specication of Letters Patent.

Application filed February 5, 1915.1 Serial No. 6,290.`

To all whom t may concern: Y

Be it known that I, Amarina I-I. MYHRE, a citizen of the United States, residing at Tacoma, in the county of Pierce and State of Washington, have invented a new and useful Improvement in Engravers Ring. Clamps, of which the following is a specification.

This invention relates to a clamp designed especially for the purpose of holding circular objects, the device automatically bringing three spaced and separate contact points into position at equal distances from a common center.

The invention also consists of theV novel features of construction hereinafter described, pointed out in the claim and shown in the accompanying drawings, in which:

Figure l is a section side elevation. Fig. -2 isa section on the line 2-2 of Fig. 1. Fig. 3 is a section on the line 3-3 of Fig. 2. Fig. 4 is a detail perspective view of one of Fig. 5 is a detail perspective view of a sector-shaped member, shown detached.- V

In the drawings 1 Y represents an engravers block provided with the usual adjustable jaws 2, and the loppositely threaded operating screw 3. This block is of the ordinary construction and may be of anyof the various types of such blocks which are in use and which are provided with jaws movable toward and away from eachother. The clamp which is the subject of this ap.- plication comprises a circular two part base 4, one section of the base being provided with pins 5 which are adapted to enter suitable Vopenings 6 formed in the other section of the base, said pins acting as guides. Upon each base section is formed a vertical armv 7 which arm curves inwardly at its upper end as indicated at S, theinner and under face being notched as shown most clearly in Figs. 4 and 5 order to engage the object to be clamped, such as aV ring.

Gopies of this patent may be -obtained for ve cents each,

Washington, D. G.

'Adj acent the base each arm is provided vwith an inwardly and downwardly sloping edge cut-away upon each side so that said edge is Patent-ea oct. 1e, i915.

V-shaped in cross section as indicated at 9.

Adapted to work between the base sections vided with a socket 11 upon its upper edge,

said socket being adapted to receive any setbe carried between a ringV ting which may 12 to be clamped. Upon opposite sides the sector is provided with V-shape grooves 12' which are adapted to slide upon thesurfaces 9 of the arms-7. Each base section is pro vided with two depending pins 13 adapted toenter suitable sockets formed in the jaws 2.

VIn operation the ring or other circular object to beheld is placed in position upon the sector 10 and betweenl the arms 7 screw 3 is then rotated and the jaws 2 caused to move toward each other. This brings the base .sections toward each other,

sector to ride upwardly upon the surfaces 9. This upward movement is continued A'until the ends 8 of the arms 7 engage the ring, 'at each point the ends of the arms and certain `flanges 11a formed upon thev sector 10 ad'- The and this movement of the said sections will cause theV The combination with the jaws of an en- Y gravers block, a sectional base, means carried by each section of the base for securing the same to one of saidjaws, ring gripping arms carried respectively by said sections, and a ring engaging sector arranged between said arms and sections and movable with respect -to them, said sector having a setting ring socket ARTHUR HALFDAN MYHRE.

Vitnesses: Y

L. E. GARNETT,

W. E. SMITH.

b'yaddressing the Commissioner of Patents,

and between said arms isa sector 10, pro- 

